EP3210778A1 - Flexographiedrucker und kartonherstellungsmaschine - Google Patents

Flexographiedrucker und kartonherstellungsmaschine Download PDF

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Publication number
EP3210778A1
EP3210778A1 EP15853294.5A EP15853294A EP3210778A1 EP 3210778 A1 EP3210778 A1 EP 3210778A1 EP 15853294 A EP15853294 A EP 15853294A EP 3210778 A1 EP3210778 A1 EP 3210778A1
Authority
EP
European Patent Office
Prior art keywords
ink
water
flexographic printer
printing plate
solvent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP15853294.5A
Other languages
English (en)
French (fr)
Other versions
EP3210778A4 (de
Inventor
Osamu Yamamoto
Kazuya Sugimoto
Osamu Hatano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Machinery Systems Co Ltd
Original Assignee
Mitsubishi Heavy Industries Printing and Packaging Machinery Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Printing and Packaging Machinery Ltd filed Critical Mitsubishi Heavy Industries Printing and Packaging Machinery Ltd
Publication of EP3210778A1 publication Critical patent/EP3210778A1/de
Publication of EP3210778A4 publication Critical patent/EP3210778A4/de
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/74—Auxiliary operations
    • B31B50/88—Printing; Embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/24—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on flat surfaces of polyhedral articles
    • B41F17/26—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on flat surfaces of polyhedral articles by rolling contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
    • B41F19/008—Apparatus or machines for carrying out printing operations combined with other operations with means for stamping or cutting out
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
    • B41F19/08—Simultaneous moulding and printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B41F23/0443—Drying sheets, e.g. between two printing stations after printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B41F23/045—Drying sheets, e.g. between two printing stations by radiation
    • B41F23/0453—Drying sheets, e.g. between two printing stations by radiation by ultraviolet dryers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B41F23/0463—Drying sheets, e.g. between two printing stations by convection
    • B41F23/0466—Drying sheets, e.g. between two printing stations by convection by using heated air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/001—Ink mist preventing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/06—Troughs or like reservoirs with immersed or partly immersed, rollers or cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/13—Means for driving fountain rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/20—Ink-removing or collecting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/28—Spray apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/02—Cleaning arrangements or devices for forme cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F1/00—Platen presses, i.e. presses in which printing is effected by at least one essentially-flat pressure-applying member co-operating with a flat type-bed
    • B41F1/26—Details
    • B41F1/40—Inking units
    • B41F1/46—Inking units using rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/005—Ink viscosity control means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/14—Cleaning characterised by the methods or devices using ultrasonic energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/26—Spraying devices

Definitions

  • the present invention relates to a flexographic printer and a box-making machine having the same.
  • a technology of a printer which performs printing using a plate is applied not only to printing of printed matters but also to various fields.
  • a printing atmosphere such as a temperature or humidity influences a print quality
  • a technology which adjusts the printing atmosphere is suggested so as to obtain a predetermined print quality.
  • PTL 1 discloses a technology which forms a light emitting layer on a substrate by flexographic printing using a letterpress (printing plate).
  • the light emitting layer is formed by printing ink for the light emitting layer, in which polymer organic light-emitting matters are dissolved and dispersed in a solvent, on the substrate.
  • the film thickness of ink varies due to the atmosphere of a solvent gas. Accordingly, a technology is suggested in which the solvent gas for ink is supplied to a closed space in which the periphery of the printing plate is covered with a plate cover so as to adjust the atmosphere of the solvent gas.
  • PTL 2 discloses a technology which covers a portion reaching the transfer from ink around a plate cylinder or a blanket cylinder using a cover and adjusts the internal temperature.
  • PTL 3 discloses a technology in which a plate surface portion from inking to transfer is sealed by a cover and concentration of a solvent for ink on the plate surface is constantly maintained so as to obtain a predetermined printing density in gravure printing which uses an intaglio plate.
  • the film thickness of the ink on the printing plate surface becomes thinner by the amount of the transferred ink after the ink is transferred to an object to be printed than before the ink is transferred to the object to be printed.
  • the film thickness of the ink before the ink is transferred is thin, the film thickness of the ink on the printing plate surface after the ink is transferred becomes extremely thin.
  • moisture is evaporated from the water based ink on the printing plate surface until new ink is supplied from the anilox roll again after the ink is transferred, and there is a possibility that the printing plate surface may be dried.
  • PTLs 1 to 3 are technologies which adjust the atmosphere of the plate surface until ink is transferred. Accordingly, no attention is paid to the above-described problems in the region of the printing plate after the ink is transferred, and the above-described problems cannot be solved.
  • a flexographic printer of the present invention and a box-making machine having the same are made in consideration of the above-described problems, and an object thereof is to ensure a print quality even in a case where the line number of the printing plate increases.
  • the present invention is not limited to the object, the present invention includes effects according to configurations shown in embodiments of the present invention described below, and another object thereof is to exert effects which cannot be obtained by the related art.
  • the ink solvent supply unit supplies the solvent for ink to the surface of the printing plate in a post-ink transfer region which is a downstream of the ink transfer site in a rotation direction of the plate cylinder and an upstream of the ink supply site in the rotation direction of the plate cylinder, particularly, the solvent for ink is supplied to the surface of the printing plate in the post-ink transfer region in which ink is easily dried in a case where the line number of the printing plate increases, and it is possible to ensure the print quality even in the case where the line number of the printing plate increases.
  • the box-making machine of the present invention since the box-making machine includes the flexographic printer, the above-described effects can be obtained.
  • the direction of gravity is the lower side
  • the direction opposite to the direction of gravity is the upper side
  • the flexographic printer is used to print an object to be printed such as a corrugated fiberboard or a wrapping paper using various inks such as water based ink or UV ink.
  • a flexographic printer which prints a corrugated fiberboard using water based ink is described as an example.
  • a flexographic printer which is applied to a box-making machine which manufactures (makes) a corrugated box from a corrugated fiberboard is described.
  • a paper feed section A, a print section B, a slotter-creaser section C, a die-cut section D, a folder-gluer section E, and a counter-ejector section F are provided in this order from the upstream side of a process (box-making line).
  • the right side is the upstream of the process
  • the left side is the downstream of the process
  • a corrugated fiberboard S is transported in the direction of an arrow a to make a box.
  • corrugated fiberboards S are stacked so as to be arranged in the same direction.
  • corrugated fiberboards S from the lower layer side of a plurality of stacked corrugated fiberboards S are fed to the print section B one by one.
  • the print section B printing is performed on the corrugated fiberboard S, and ink on the corrugated fiberboard S is dried.
  • printing is performed on the corrugated fiberboard S by each color of print units B 11 , B 12 , B 13 , B 14 corresponding to four colors of CMYK, and the ink on the corrugated fiberboard S is heated and dried by the dry units B 21 , B 22 , B 23 , and B 24 provided on the immediately downstream of the print units B 11 , B 12 , B 13 , B 14 .
  • the print units B 11 , B 12 , B 13 , B 14 are configured similarly to each other except that the used colors of ink are different from each other, and the dry units B 21 , B 22 , B 23 , and B 24 are configured similarly to each other.
  • ink of various colors such as a single color or six colors may be used.
  • the print units and the dry units corresponding to the number of the colors of the used ink are provided. However, some dry units or all dry units may be omitted.
  • slotter-creaser section C grooving and formations of rule lines are performed at a plurality of sites of the corrugated fiberboard S in the transport direction, the ruled lines b and the grooves c (the reference numerals are assigned to only one site) are formed, and an adhesion piece d is formed.
  • drilling is performed to form a handle hole or an air hole.
  • wrap-around caser may be used in the box-making machine.
  • the wrap-around caser is a machine in which the slotter creaser section C is not provided, and in the die-cut section D, drilling and punching are performed to form a handle hole, an air hole, or the like, grooving and formation of a ruled line are performed to prepare a box having a specific shape, the corrugated fiberboard S which has been printed and subjected to the grooving and the formation of the ruled line is introduced into a manufacturing line of a product, products are stacked on the corrugated fiberboard S to be loaded, a box is formed to enclose the products, and the products are wrapped.
  • the number of the corrugated boxes W is counted, and the corrugated boxes W are stacked so as to be arranged in the same direction.
  • the stacked corrugated boxes (corrugated box group G 2 ) are bound and packed every predetermined number of corrugated boxes so as to be shipped.
  • the flexographic printer can be applied to each of the print units B 11 , B 12 , B 13 , and B 14 of the print section B.
  • the flexographic printer is applied to each of the print units B 11 , B 12 , B 13 , and B 14 .
  • the flexographic printer will be described in terms of one of the print units B 11 , B 12 , B 13 , and B 14 .
  • a chamber-type flexographic printer is described as an ink supply method of the flexographic printer.
  • other ink supply methods may be adopted, which include a two-roll type method which supplies ink to a printing plate of a plate cylinder using a fountain roller and an anilox roller which are provided so as to be immersed into ink stored in an ink pan, a doctor type method which supplies ink to a printing plate of a plate cylinder using an anilox roller which is provided so as to be immersed into ink stored in an ink pan and a doctor blade which scrapes off ink on the peripheral surface of the anilox roller, or the like.
  • the flexographic printer includes an ink chamber 10, an anilox roll 20, an ink receiving pan 29, a plate cylinder 30 in which a printing plate 31 is wound around the outer periphery, and a receiving roll 39.
  • An axial center C 1 of the anilox roll 20, an axial center C 2 of the plate cylinder 30, and an axial center C 3 of the receiving roll 39 are provided so as to be parallel to each other, and are disposed in an apparatus width direction (hereinafter, simply referred to as a "width direction") of the flexographic printer.
  • the width direction is a direction orthogonal to the transport direction (indicated by a double arrow in Fig. 1 ) of the corrugated fiberboard S.
  • the anilox roll 20, the plate cylinder 30, and the receiving roll 39 are rotated in directions opposite to each other by adjacent cylinders or rolls, and rotating speeds of the anilox roll 20, the plate cylinder 30, and the receiving roll 30 correspond to the transport speed of the corrugated fiberboard S.
  • the ink chamber 10 has an internal space 100 in which ink is stored, and is connected to an ink tank (not shown) via an ink supply pipe 10a and an ink discharge pipe 10b.
  • Ink is pressure-fed by a pump (not shown), flows through the ink supply pipe 10a from the ink tank, and is supplied to the internal space 100.
  • the ink overflowed from the internal space 100 flows through the ink discharge pipe 10b and is returned to the ink tank.
  • a doctor blade 11 and a seal blade 12 are attached to the ink chamber 10.
  • the distal end of each of the blades 11 and 12 is in contact with a peripheral surface 20a of the anilox roll 20 or is attached so as to have a minute gap with the peripheral surface 20a.
  • the anilox roll 20 attaches ink to the printing plate 31 of the plate cylinder 30. Fine recessed portions (also referred to as “reliefs” or “cells”) are engraved on the peripheral surface 20a of the anilox roll 20.
  • Ink is supplied from the ink chamber 10 to the peripheral surface 20a of the anilox roll 20, the ink is accommodated in the recessed portions of the peripheral surface 20a, and ink which does not enter the recessed portions is scrapped off by the above-described doctor blade 11.
  • the recessed portions are formed to be finer (with a shallower depth) as the line number of the printing plate 31 increases. In other words, in most cases, the ink storage amount of the recessed portions decreases as the line number of the printing plate 31 increases.
  • the "line number” is a measure which indicates the accuracy of printing, and means the number of rows of halftone dots for a certain range (predetermined length).
  • the ink receiving pan 29 is configured to receive ink which is dropped (flows downward) when the ink is supplied from the ink chamber 10 to the anilox roll 20 and ink which is scraped off by the doctor blade 11, or to receive ink and a washing liquid when the ink chamber is cleaned. Accordingly, the ink receiving pan 29 is provided below the ink supply site from the ink chamber 10 to the anilox roll 20. In addition, the disposition site of the ink receiving pan 29 will be described in detail below.
  • the plate cylinder 30 is also referred to a printing cylinder, and the printing plate 31 is wound around the outer periphery of the plate cylinder 30.
  • the plate cylinder 30 is provided so that the printing plate 31 on the outer periphery comes into contact with the anilox roll 20 at a predetermined pressure at the ink supply site P 1 . That is, ink is supplied from the anilox roll 20 to the printing plate 31 of the plate cylinder 30 at the ink supply site P1.
  • the printing pressure of the plate cylinder 30 is adjusted such that the printing plate 31 on the outer periphery comes into contact with the corrugated fiberboard S at an ink transfer site P 2 at a predetermined pressure (for example, a pressure corresponding to a so-called kiss-touch). Accordingly, ink is transferred from the printing plate 31 of the plate cylinder 30 to the corrugated fiberboard S at the ink transfer sist P 2 .
  • the printing plate 31 is a flexible letterpress formed of rubber, resin, or the like. Similarly to the above-described anilox roll 20, in the printing plate 31, the amount of ink to be loaded decreases as the line number increases. That is, in most cases, the film thickness of the ink on the surface 31a of the printing plate 31 (hereinafter, referred to as a "printing plate surface”) is reduced as the line number increases.
  • the receiving roll 39 is provided in a state where a transport belt 9 is interposed between the plate cylinder 30 and the receiving roll 39.
  • the corrugated fiberboard S is transported while being interposed between the transport belt 9 and the plate cylinder 30.
  • the transport belt 9 has air permeability. Specifically, a large number of ventilation holes 9a (in FIG. 1 , the size is exaggerated for easiness of understanding) are formed on the transport belt 9. The ventilation holes 9a are formed to transport the corrugated fiberboard S while suctioning the corrugated fiberboard S onto the transport belt 9. Accordingly, a suction device (not shown) for suctioning on the side opposite to the side on which the corrugated fiberboard S is placed (in this case, the lower side) is provided on the transport belt 9.
  • a configuration may be used, in which a plurality of transport rollers are used instead of the transport belt 9, and the corrugated fiberboard S is transported while being interposed between the transport rollers and the plate cylinder 30.
  • the transport belt 9 since the elongation of the transport belt 9 does not influence the transport of the corrugated fiberboard S, it contributes to high-precision printing.
  • the moisture supply unit 50 is an ink solvent supply unit for supplying a solvent for ink (hereinafter, simply referred to as an "ink solvent") on the printing plate surface 31a. Since the flexographic printer uses water based ink, water corresponds to the ink solvent.
  • the moisture supply unit 50 supplies moisture to the printing plate surface 31a in a post-ink transfer region R 1 which is a downstream of the ink transfer site P 2 in the rotation direction of the plate cylinder 30 and an upstream of the ink supply site P 1 in the rotation direction of the plate cylinder 30.
  • moisture is not supplied to a pre-ink transfer region R 2 which is a downstream of the ink supply site P 1 in the rotation direction of the plate cylinder 30 and an upstream of the ink transfer site P 2 in the rotation direction of the plate cylinder 30.
  • the post-ink transfer region R 1 means a space which is positioned on the upstream side of a phase corresponding to the ink supply site P 1 (hereinafter, referred to as an "ink supply phase") ⁇ 1 in the rotation direction of the plate cylinder based on the rotation direction of the plate cylinder 30 and on the downstream side of a phase (hereinafter, referred to as an "ink supply phase”) ⁇ 2 corresponding to the ink transfer site P 2 based on the rotation direction of the plate cylinder 30, and is positioned along the periphery of the plate cylinder 30 on the outer portion of the plate cylinder 30.
  • the pre-ink transfer region R 2 means a region except for the post-ink transfer region R 1 of the space along the periphery of the plate cylinder 30 outside the plate cylinder 30.
  • a guide 60 which covers the post-ink transfer region R 1 from the outside of the plate cylinder 30 and guides moisture supplied by the moisture supply unit 50 to the printing plate surface 31a, the ink receiving pan 29 provided above the guide 60, and a tray 70 which receives water droplets attached to the guide 60 are provided.
  • the guide 60 and the tray 70 are separately provided from each other.
  • a water level sensor 80 which detects the amount of the water stored in a storage portion 51 and a temperature-humidity sensor 81 which detects the temperature and humidity of the post-ink transfer region R 1 are provided.
  • a controller 90 which performs a control based on various parameters detected by the sensors 80 and 81 is provided.
  • a structure is exemplified in which the moisture supply unit 50, the guide 60, and the tray 70 are supported to a main bracket 40 which is supported by a side frame (not shown) or the like via a support base 44 using brackets 41, 42, and 43.
  • various support structures may be adopted according to limitation of brackets provided in the vicinity thereof or the layout.
  • the moisture supply unit 50 the peripheral configuration, and the controller 90 will be described in this order.
  • the moisture supply unit 50 includes the storage portion 51 in which water is stored, a ultrasonic mist generator 52 which atomizes water in the storage portion 51 by ultrasonic waves, and a communication portion 53 which communicates with the storage portion 51 and the post-ink transfer region R 1 .
  • the storage portion 51 stores water for ink solvent.
  • the storage portion 51 is formed in a rectangular parallelepiped shape.
  • various shapes can be adopted according to the surrounding structure and the layout.
  • a plurality of (here, three) storage portions 51 are provided so as to be arranged in the width direction.
  • a fan 54 which serves as a blowing unit, and a water level sensor 80 which detects the height (water level) of the stored water are provided.
  • the fan 54 blows air above the water stored in the storage portion 51.
  • an axial flow blower type fan is exemplified as the fan 54.
  • a blower may be used as the blowing unit instead of or in addition to the fan 54.
  • a centrifugal blower type blower can be used as the blower.
  • information of the water level detected by the water level sensor 80 is transmitted to the controller 90.
  • the storage portion 51 includes two water-flow ports 511 and 512 through which the stored water flows and three opening portions 513, 514, and 515 through which air above the water surface in the storage portion 51 flows.
  • the water-flow port positioned at the upper portion (hereinafter, referred to as an "upper water-flow port") 511 functions as a drain port when the water in the storage portion 51 ascends, and the water-flow port positioned at the lower portion (hereinafter, referred to as a "lower water-flow port”) 512 functions as a water supply-drain port of the storage portion 51.
  • the upper water-flow ports 511 of the adjacent storage portions 51 are connected to each other, and the lower water-flow ports 512 of the storage portions 51 are connected to the water tank 59 in which water is stored.
  • a water supply source (not shown) is connected to the upstream side of the water tank 59, and a pump P for supplying and draining water is interposed between the water tank 59 and the lower water-flow port 512.
  • a plurality of (here, four) fans 54 are provided in one storage portion 51 so as to be arranged in the width direction.
  • a plurality of suction opening portions 515 (the reference numeral is assigned to only one suction opening portion) described below are provided so as to be arranged in the width direction.
  • Fig. 3 is a view when main portions including the moisture supply unit 50 are viewed in the direction (downstream side in the transport direction) shown by the double arrow of Fig. 2 .
  • duct opening portion is a communication port between the inside of the communication portion 53 and the inside of the storage portion 51, and the mist generated by the ultrasonic mist generator 52 is fed to a communication passage 53 by air blown from the fan 54.
  • suction opening portion is provided to suction the outside air from the back face (the downstream side in the transport direction) of the fan 54.
  • the ultrasonic mist generator 52 is also referred to as a nebulizer and is provided in water stored in the storage portion 51.
  • a piezoelectric ceramics vibrator can be used as the ultrasonic mist generator 52.
  • vibration energy of ultrasonic waves generated by applying high-frequency alternating voltages to the piezoelectric ceramics vibrator is transmitted to the water surface, and mist (minute water droplets floating in the air) can be generated from the water surface.
  • a plurality of (here, six) ultrasonic mist generators 52 are provided in one storage portion 51 so as to be arranged in the width direction.
  • the communication portion 53 communicates a space above the water surface in the storage portion 51 and the post-ink transfer region R 1 , and is a duct through which mist generated by the ultrasonic mist generator 52 flows.
  • the communication portion 53 includes an opening portion on the storage portion 51 side (hereinafter, referred to as a “storage portion-side opening portion”) 531 and an opening portion on the plate cylinder 30 side (hereinafter, referred to as a “plate cylinder-side opening portion”) 532.
  • the storage portion-side opening portion 531 is provided so as to overlap the duct opening portion 514 of the storage portion 51 in an elevation view
  • the plate cylinder-side opening portion 532 is provided so as to overlap opening portions 43a and 62a described below in an elevation view.
  • the communication portion 53 has a shape which rises and is inclined as the communication portion approaches the post-ink transfer region R 1 . Moreover, the communication portion 53 includes a curved crank structure. As shown in Fig. 3 , one communication portion 53 (the reference numeral is assigned to only one communication portion) is provide with respect to one storage portion 51.
  • the communication portion 53 includes a first communication portion 53a, a second communication portion 53b, and a third communication portion 53c in the order in which the mist fed by the fan 54 flows.
  • the first communication portion 53a and the second communication portion 53b are oriented so as to intersect each other and are connected to each other, and similarly, the second communication portion 53b and the third communication portion 53c are oriented so as to intersect each other and are connected to each other.
  • the communication portion 53 has a crank structure.
  • the first communication portion 53a has a shape in which the height position rises and is inclined from the storage portion 51 side toward the post-ink transfer region R 1 .
  • the second communication portion 53b extends in the vertical direction.
  • the third communication portion 53c is provided such that the height position provided toward the post-ink transfer region R 1 rises.
  • a drain port is provided in the communication portion 53, and a drain pipe is connected to the drain port.
  • the guide 60, the ink receiving pan 29, and the tray 70 which are the peripheral configurations of the moisture supply unit 50 will be described.
  • a structure in which the guide 60 and the ink receiving pan 29 cooperate with each other to guide mist (moisture) to the printing plate surface 31a is exemplified, and the ink receiving pan 29, the guide 60, and the tray 70 will be described in this order.
  • the ink receiving pan 29 includes a container-shaped main body portion 29a which has an opening in the upper portion, and an extension portion 29b which is provided to extend from the main body portion 29a toward the ink supply site P 1 .
  • Each of the surface portion of the main body portion 29a on the plate cylinder 30 side and the extension portion 29b (hereinafter, the surface portion and the extension portion 29b are collectively referred to as a "plate cylinder-side surface portion 291”) functions as a cover which covers the plate cylinder 30 from the outside. That is, the plate cylinder-side surface portion 291 is positioned above the guide 60 and is disposed such that the post-ink transfer region R 1 is along the peripheral surface 30a of the plate cylinder 30.
  • the guide 60 cooperates with the ink receiving pan 29 to function as a cover which covers the post-ink transfer region R 1 from the outside of the plate cylinder 30.
  • the guide 60 is disposed along the peripheral surface 30a of the plate cylinder 30 in a state where the post-ink transfer region R 1 is interposed between the guide 60 and the plate cylinder 30.
  • the guide 60 is made of stainless steel having antirust properties.
  • the guide 60 is formed to be bent along the peripheral surface 30a of the plate cylinder 30, and can be roughly divided into portions such as an upper guide portion 61, an intermediate guide portion 62, and a lower guide portion 63 in this order from above.
  • the intermediate guide portion 62 is provided to extend in the vertical direction.
  • the guide opening portion 62a is formed in the intermediate guide portion 62.
  • the guide opening portion 62a is provided so as to overlap the plate cylinder-side opening portion 532 of the communication portion 53 and the opening portion 43a of the bracket 43 in an elevation view, and is a supply port through which the mist from the moisture supply unit 50 is supplied to the post-ink transfer region R 1 .
  • the upper guide portion 61 is formed to be inclined toward the upstream side in the transport direction as the upper guide portion 61 is directed upward
  • the lower guide portion 63 is formed to be inclined toward the upstream side in the transport direction as the lower guide portion 63 is directed downward.
  • a space is formed between the upper guide portion 61 and the ink receiving pan 29, and the extension plane of the upper guide portion 61 and the extension plane of the plate cylinder-side surface portion 291 in the ink receiving pan 29 are disposed so as to overlap each other or approach each other. According to this disposition, the post-ink transfer region R 1 is surrounded by the guide 60 and the plate cylinder-side surface portion 291 of the ink receiving pan 29 over a wide range from the outside of the plate cylinder 30.
  • the installation site of the ink receiving pan 29 is set according to the installation sites of the ink chamber 10 (refer to Fig. 1 ) and the anilox roll 20.
  • the upper guide portion 61 of the guide 60 extends to the region corresponding to the plate cylinder-side surface portion 291 of the ink receiving pan 29.
  • a plurality of (here, three) guide portions 60 are provided in a divided manner in the width direction.
  • the guide portions 60 may be integrally provided in the width direction.
  • the tray 70 receives water droplets which are attached to the guide 60.
  • the water droplets to be collected by the tray 70 have sizes which are dropped by the gravity while the minute water droplets which are components of the mist float in air.
  • the minute water droplets of the mist are attached to the guide 60 to be agglomerated, the minute water droplets become large water droplets and are dropped (flow downward) due to the gravity.
  • the tray 70 includes a tray portion 71 which receives water droplets, and an attachment portion 72 which is attached to the bracket 42.
  • the attachment portion 72 has a shape in which the open side of a U shape in a longitudinal section is directed downward so as not to interfere with the main bracket 40.
  • the tray 70 is made of stainless steel having antirust properties.
  • a plurality of (here, three) divided tray portions 71 are provided so as to be connected in the width direction.
  • the attachment portion 72 is provided in each of both ends of the tray portions 71 in the longitudinal direction (width direction).
  • the trays 70 may be integrally provided in the width direction. In this case, compared to a structure where the plurality of tray portions 71 are connected to each other, it is possible to prevent water leakage from the connected sites.
  • the tray portion 71 is provided below the guide 60.
  • the tray portion 71 includes a horizontal portion 71a which extends in the horizontal direction, and a bent portion 71b which is formed to be bent on the plate cylinder 30 side with respect to the horizontal portion 71a.
  • a drain port 78 through which the collected water droplets are drained is provided in the horizontal portion 71a.
  • a drain pipe 79 is connected to the drain port 78.
  • the bent portion 71b has a shape in which the open side of a V shape in a vertical section is directed toward the downstream side in the transport direction, and includes a first bent portion 711 on the horizontal portion 71a side and a second bent portion 712 which is provided above the first bent portion 711.
  • the first bent portion 711 is provided so as to be positioned below the lower end (the upstream end in the transport direction) of the lower guide portion 63 in the guide 60, is bent so as to be positioned above as it approaches the plate cylinder 30, and corresponds to the lower side of the V shape.
  • the second bent portion 712 is bent so as to be positioned above as it is separated from the plate cylinder 30 side, and corresponds to the upper side of the V shape.
  • the second bent portion 712 is disposed along the peripheral surface 30a of the plate cylinder 30.
  • the distal end of the second bent portion 712 is provided so as to be positioned on the upstream side of the lower end of the lower guide portion 63 in the guide 60 in the transport direction.
  • the controller 90 performs a mist supply control which the supply amount of the mist supplied by the moisture supply unit 50, and a water supply-drainage control which operates a pump P (refer to Fig. 3 ) based on the information of the water level in the storage portion 51 transmitted from the water level sensor 80.
  • the ultrasonic mist generator 52 and the fan 54 are continuously or intermittently operated (ON-OFF), and mist is supplied into the post-ink transfer region R 1 .
  • mist is generated above the water surface in the storage portion 51 by the ultrasonic mist generator 52, and the mist flows through the communication portion 53 by blowing of the fan 54 so as to be supplied into the post-ink transfer region R 1 .
  • Whether or not there is a possibility that the amount of the moisture on the printing plate surface 31a is insufficient is determined based on the temperature and humidity detected by the temperature-humidity sensor 81. For example, it may be that there is a possibility that the amount of the moisture on the printing plate surface 31a is insufficient when the detected temperature is a predetermined temperature or more or the detected humidity is predetermined humidity or less.
  • each of the predetermined temperature and the predetermined humidity is a threshold value which determines whether or not the printing plate surface 31a in the post-ink transfer region R 1 is dry, and is preset experimentally or empirically.
  • a combination (map) of a predetermined temperature and predetermined humidity at which the printing plate surface 31a may be dried is stored in the controller 90, and the ultrasonic mist generator 52 and the fan 54 may be operated based on the map.
  • the generated amount of the mist generated by the ultrasonic wave generator 52 may increase as the detected temperature is higher than the predetermined temperature and the detected humidity is lower than the predetermined humidity so as to increase the amount of air blown by the fan 54.
  • a map in which the detected temperature and the detected humidity are combined with the predetermined temperature and the predetermined humidity according to the characteristics may be stored in the controller 90. That is, for example, the mist supply control may be a feedback control based on the temperature and the humidity detected by the temperature-humidity sensor 81 using the map.
  • the predetermined temperature may be set to a low temperature side in comparison with the normal printing, and the predetermined humidity may be set to a high humidity side in comparison with the normal printing.
  • the predetermined temperature or the predetermined humidity may be variably set as the line number of the printing plate 31 increases or as the rotating speed of the plate cylinder 30 decreases.
  • the controller 90 uses either the temperature or the humidity detected by the temperature-humidity sensor 81.
  • the controller 90 may perform the mist supply control using the temperature or the humidity detected by the temperature-humidity sensor 81.
  • the amount of the water stored in the storage portion 51 is adjusted. Specifically, if the water level detected by the water level sensor 81 is a predetermined water level or less, the pump P is operated, and the control of the water supplied into the storage portion 51 is performed.
  • the predetermined water level is a water level at which mist can be stably generated by the ultrasonic mist generator 52, and is preset experimentally or empirically. Accordingly, the predetermined water level is set so as to be higher than the water level at which the ultrasonic mist generator 52 is exposed from the water, and is set to a water level which is lower than the fan 54.
  • the drainage control of operating the pump P is also performed when water is drained from the storage portion 51 or the water tank 59 by the instruction of an operator.
  • the printing plate surface 31a in the post-ink transfer region R 1 is easily dried particularly in a case where the line number of the printing plate 31 increases, since the moisture supply unit 50 supplies mist to the printing plate surface 31a in the post-ink transfer region R 1 , the moisture evaporated from the printing plate surface 31a is offset by the mist supplied by the moisture supply unit 50, and it is possible to prevent drying of the printing plate surface 31a. Accordingly, it is possible to maintain the printing plate surface 31a in a favorable moisture retaining state, and it is possible to ensure a print quality even in a case where the line number of the printing plate 31 increases. For example, it is possible to ensure a desired quality even when full-color printing is performed using CMYK ink.
  • the atmosphere of the printing plate surface 31a is humidity-adjusted and the mist is supplied to the printing plate surface 31a, even when mist is not directly supplied to the printing plate surface 31a, it is possible to prevent drying of the printing plate surface 31a, and it is possible to ensure a print quality even in a case where the line number of the printing plate 31 increases.
  • the printing plate surface 31a is dried, when the flexographic printer is operated again, it is necessary to clean ink from the printing plate surface 31a, which increases a burden on an operator. Moreover, since the flexographic printer is applied to the box-making machine, it is necessary to stop the entire box-making line, which lowers productivity. In addition, in order to prevent drying of the printing plate surface 31a, it is necessary to add a drying retardant to ink or manage the ink viscosity to deal with it, which also increases a burden on an operator. Meanwhile, according to the flexographic printer of the present embodiment, since it is possible to prevent drying of the printing plate surface 31a, it is possible to decrease a burden on an operator, and it is possible to improve productivity.
  • the guide 60 which covers the post-ink transfer region R 1 from the outside of the plate cylinder 30 and guides moisture supplied by the moisture supply unit 50 to the printing plate surface 31a is provided, it is possible to prevent diffusion of the mist supplied into the post-ink transfer region R 1 , and it is possible to effectively supply mist to printing plate surface 31a.
  • the tray 70 which receives water droplets attached to the guide 60 Since the tray 70 which receives water droplets attached to the guide 60 is provided, the mist supplied into the post-ink transfer region R 1 is attached to the guide 60 and agglomerates to form large water droplets, and even if the water droplets are dropped, the water droplets can be received by the tray 70, and it is possible to prevent water droplets from being attached to the corrugated fiberboard S.
  • the tray 70 is provided in the flexographic printer of the present embodiment, it is possible to prevent water droplets from being attached to the corrugated fiberboard S, and it is possible to improve a print quality.
  • drain port 78 through which collected water droplets are drained is formed in the horizontal portion 71a of the tray 70 and the drain pipe 79 is connected to the drain port 78, it is possible to appropriately treat the water droplets collected by the tray 70.
  • the distal end of the second bent portion 712 in the tray 70 is provided so as to be positioned on the upstream side of the lower end of the lower guide portion 63 in the guide 60 in the transport direction. Accordingly, when the water droplets move along the guide 60 and are dropped, the tray 70 can reliably receive the water droplets.
  • the second bent portion 712 since the second bent portion 712 is disposed along the peripheral surface 30a of the plate cylinder 30, the second bent portion 712 functions as a cover which covers the post-ink transfer region R 1 from the outside of the plate cylinder 30, it is possible to prevent diffusion of mist supplied into the post-ink transfer region R 1 , and it is possible to effectively supply mist to printing plate surface 31a.
  • the second bent portion 712 which is provided above the first bent portion 711 is provided so as to be positioned on the upstream side of the lower end of the lower guide portion 63 in the guide 60 in the transport direction, it is possible to prevent the water droplets dropped from the guide 60 from being scattered on the printing plate surface 31a. Specifically, since the second bent portion 712 catches jumping when the water droplets from the lower end of the lower guide portion 63 in the guide 60 are dropped on the first bent portion 711 and collide with the first bent portion 711, it is possible to prevent the water droplets from being attached to the printing plate surface 31a.
  • the guide 60 and the tray 70 are separately provided from each other, it is possible to detach and attach them independently from each other, and it is possible to improve maintainability.
  • the moisture supply unit 50 includes the storage portion 51 in which water is stored, the ultrasonic mist generator 52 which atomizes the water in the storage portion 51 by ultrasonic waves, and the communication portion 53 which communicates with the storage portion 51 and the post-ink transfer region R 1 , it is possible to effectively atomize the water stored in the storage portion 51 by the ultrasonic mist generator 52, and it is possible to supply mist to the post-ink transfer region R 1 through the communication portion 53.
  • the mist generated by the ultrasonic mist generator 52 is fed to the communication passage 53 by air blown from the fan 54, the mist is effectively fed to the post-ink transfer region R 1 through the communication portion 53, and it is possible to effectively prevent drying of the printing plate surface 31a in the post-ink transfer region R 1 .
  • the communication portion 53 Since the communication portion 53 has a shape which rises and is inclined as the communication portion approaches the post-ink transfer region R 1 , even when mist is attached to the inside of the communication portion 53 and agglomerates to form large water droplets, it is possible to make the water droplets to flow toward the storage portion 51.
  • the communication portion 53 since the communication portion 53 has the curved crank structure, even when large water droplets flows from the storage portion 51 to the communication portion 53, the water droplets are attached to the curved site of the communication portion 53. Specifically, it is possible to make the water droplets to flow downward in the first communication portion 53a and the third communication portion 53c having inclined shapes.
  • the water droplets can be attached to the curved sites of the inner wall of the second communication portion 53b which is connected to intersect the first communication portion 53a or the inner wall of the third communication portion 53c which is connected to intersect the second communication portion 53a, and the water droplets can flow downward or can be dropped.
  • drain port is provided in the communication portion 53 and the drain pipe is connected to the drain port, it is possible to rapidly discharge large water droplets attached to the communication portion 53 to the outside.
  • the controller 90 which controls the supply amount of the mist supplied by the moisture supply unit 50 based on the temperature and the humidity detected by the temperature-humidity sensor 81, it is possible to reliably ensure a print quality.
  • the water supply-drainage control is performed by the controller 90, it is possible to reduce a burden on an operator with respect to the water supply-drainage.
  • the corrugated fiberboard S is transported while being suctioned, for example, in a technology which supplies mist into a closed space which surrounds the entire plate cylinder 30, the mist is easily suctioned. Meanwhile, in the flexographic printer of the present embodiment, since the guide 60 covers the post-ink transfer region R 1 without closing (sealing) the post-ink transfer region R 1 from the outside of the plate cylinder 30, the structure which covers the pre-ink transfer region R 2 is not provided. Accordingly, the corrugated fiberboard S is stably transported, the mist can be fastened to the post-ink transfer region R 1 , and it is possible to effectively supply moisture to the printing plate surface 31a.
  • the flexographic printer of the present embodiment performs printing using water ink
  • the flexographic printer of the present invention can be applied to general flexographic printer in which water based ink is widely used.
  • the above-described effects can be obtained by only adding components such as the moisture supply unit 50, the cover 60, and the tray 70.
  • the above-described effects can be obtained by only applying the flexographic printer of the present embodiment to the print unit of a general box-making machine.
  • the configuration of a moisture supply unit 150 is different from the configuration of the above-described moisture supply unit 50.
  • the configuration of a storage portion 151 corresponding to the above-described storage portion 51 is different from that of the storage portion 51
  • the configuration of a water tank 159 corresponding to the above-described water tank 59 is different from that of the water tank 59
  • the above-described water level sensor 80 or the controller 90 according to the water supply-drainage control is not used.
  • the configurations of the modification example are different from those of the first embodiment except for the above-described configurations, similar reference numerals are assigned to those, and descriptions thereof are omitted.
  • a water-flow portion (hereinafter, referred to as a "lower water-flow port") 112 is provided below the storage portion 151.
  • the lower water-flow ports 112 are respectively provided on both end portions in the width direction of each storage portion 151.
  • a water-flow port is not provided above the lower water-flow port 112.
  • the storage portion 151 stores the water for ink solvent (indicated by oblique lines), a plurality of (here, three) storage portions 151 are provided in the width direction, and the lower water-flow ports 112 of the storage portions 151 adjacent to each other in the width direction are connected to each other via a water supply pipe 113 between storage portions.
  • fans 54 the reference numeral is assigned to only one fan
  • blowers not shown
  • ultrasonic mist generators 52 the reference numeral is assigned to only one ultrasonic mist generator
  • the lower water supply port 112 on one side in the width direction is connected to the water tank 159 via the tank water supply pipe 114. Since the tank water supply pipe 114 and the water supply pipe 113 between storage portions communicate with each other in a state where a valve is not interposed, the water level of the storage portion 151 and the water level of the water tank 159 are interlocked with each other so as to be the same water level.
  • a drain pipe 115 is connected to the lower water supply port 112 on the other end side in the width direction.
  • a drain valve 116 is provided in the drain pipe 115.
  • the water tank 159 stores water which is supplied to the storage portion 151.
  • a water supply pipe 160 is connected to the upper portion of the water tank 159, and the tank water supply pipe 114 is connected to a water-flow port 161 positioned on the lower portion of the water tank 159 (hereinafter, referred to as a "lower water-flow port").
  • a float 170 is provided in the water tank 159.
  • a water supply source (not shown) is connected to the upstream of the water supply pipe 160.
  • the float 170 includes a float body portion 171 which floats on water stored in the water tank 159, and a rigid float shaft 172 which is connected to the float body portion 171 and a vertical wall portion 159a of the water tank 159.
  • the buoyant force of the float body portion 171 is set to be larger than the water supply pressure from the water supply pipe 160.
  • a proximal end portion 172a of the float shaft 172 is swingably connected to the vertical wall portion 159a of the water tank 159, and a distal end portion 172b of the float shaft 172 is connected to the float body portion 171. Accordingly, if the float body portion 171 is displaced upward and downward according to the water level of the water tank 159, the float body portion 171 and the float shaft 172 are swung with the proximal end portion 172a of the float shaft 172 as a supporting point.
  • a drain stopper 179 is provided at an intermediate portion 172c between the proximal end portion 172a and the distal end portion 172b.
  • the drain stopper 179 stops the water supply from the water supply pipe 160. That is, the drain stopper 179 closes a water supply port 160a on the downstream end of the water supply pipe 160 to stop the water supply from the water supply pipe 160. Specifically, as shown in Fig. 5A , the drain stopper 179 closes the water supply port 160a if the water level of the water tank 159 rises, and as shown in Fig. 5B , the drain stopper 179 opens the water supply port 160a if the water level of the water tank 159 is lowered.
  • the drain stopper 179 is provided so as to correspond to the position of the water supply port 160a of the water supply pipe 160.
  • the drain stopper 179 is provided at the position at which the water supply port 160a is closed when the water level of the water tank 159 is positioned at a predetermined water level.
  • the predetermined water level may use a water level similar to the predetermined water level which is used to control the water supply in the above-described first embodiment.
  • mist generated from the water in the storage portion 151 by the ultrasonic mist generator 52 or the fan 54 is supplied to the post-ink transfer region R 1 (refer to Figs. 1 and 2 ). Accordingly, as shown in Fig. 5B , the water level in the storage portion 151 is lowered, and the water level of the water tank 159 is also lowered interlockingly with this.
  • the water level of the water tank 159 is increased by the water supply and for example, the water level becomes a predetermined water level, as shown in Fig. 5A , the water level of the water tank 159 increases, and the water level of the storage portion 151 is also increased interlockingly with this.
  • the drainage is performed after the water supply from the water supply source connected to the water supply pipe 160 is stopped, and for example, is performed at the time of maintenance of the moisture supply unit 150, or the like.
  • the drain valve 116 When the moisture supply unit 150 is stopped, for example, the drain valve 116 is opened by an operator. Accordingly, the water inside each of the storage portion 151 and the water tank 159 is discharged from the drain pipe 115. Therefore, the water level of the storage portion 151 is lowered, and the water level of the water tank 159 is also lowered interlockingly with this. Accordingly, it is possible to drain water from the storage portion 151 and the water tank 159.
  • the flexographic printer according to the modification example of the first embodiment of the present invention has the above-described configuration, the above-described effects can be obtained.
  • the water level sensor 81 used in the above-described water supply-drainage control or the controller 90 according to the water supply-drainage control can be omitted, and a simple configuration can be realized. Accordingly, it is possible to ensure a print quality while preventing an increase in cost.
  • a configuration of a flexographic printer according to the second embodiment of the present invention is different from that of the flexographic printer of the first embodiment in that a two-fluid sprayer 100 is provided as an ink solvent supply unit at the site corresponding to the moisture supply unit 50 of the first embodiment, and a tray 110 of the second embodiment is different from that of the first embodiment.
  • the second embodiment is configured so as to be the same as the first embodiment except for this, and accordingly, the same reference numerals are assigned to the same configurations, and descriptions thereof are omitted.
  • the two-fluid sprayer 100 is shown so as to be schematically enlarged.
  • two fluids such as air and water are mixed with each other from the injection port 109 and the mixture is sprayed.
  • the injection port 109 is provided so as to penetrate the guide 60 and protrude toward the post-ink transfer region R 1 . Accordingly, mist from the injection port 109 is supplied to the post-ink transfer region R 1 .
  • an air supply pipe 101 through which air is supplied and a water supply pipe 102 through which water is supplied are connected to each other.
  • On/off valves 103 and 104 are respectively provided in the air supply pipe 101 and the water supply pipe 102.
  • a plurality of two-fluid sprayers 100 are provided so as to be arranged in the width direction.
  • a space (hereinafter, referred to as an "internal space") 105 (indicated by a broken line) is formed in the two-fluid sprayer 100. If the on/off valves 103 and 104 are opened, in the internal space 105, water from the water supply pipe 102 is suctioned by the air supplied from the air supply pipe 101 and atomized such that atomization is performed by a so-called carburetor or atomizer. In this way, the mixture in which mist is mixed with air is sprayed from the injection port 102.
  • Each of the on/off valves 103 and 104 is connected to a controller 90' via a control line.
  • the controller 90' controls opening and closing of each of the on/off valves 103 and 104 based on the temperature or humidity detected by the temperature-humidity sensor 81.
  • the controller 90' opens any one of the on/off valves 103 and 104 to perform the mist supply control which supplies mist into the post-ink transfer region R 1 .
  • the determination whether or not there is a possibility that the amount of moisture on the printing plate surface 31a is insufficient is performed based on the temperature and humidity detected by the temperature-humidity sensor 81.
  • each of the on/off valves 103 and 104 may adopt an on/off valve which can adjust an opening degree.
  • the mist supply control it is possible to increase the spraying amount by adjusting the opening degree of each of the on/off valves 103 and 104 as the detected temperature becomes higher than a predetermined temperature and the detected humidity becomes lower than a predetermined humidity.
  • the tray 110 is integrally provided with the guide 60.
  • the tray 110 has a shape which is positioned to rise as it approaches the plate cylinder 30 from the lower guide portion 63 in the guide 60.
  • connection site between the tray 110 and the guide 60 is a site which has the lowest vertical height in the tray 110 and the guide 60, a drain port 118 through which water droplets collected by the tray 110 is drained is provided at this site, and a drain pipe 119 is connected to the drain port 118.
  • the flexographic printer according to the second embodiment of the present invention has the above-described configuration, the following effects can be obtained.
  • the two-fluid sprayer 100 is provided in which two fluids such as air and water are mixed with each other and the mixture is sprayed to the post-ink transfer region R1 from the injection port 109, it is possible to ensure a print quality even in a case where the line number of the printing plate 31 increases by supplying moisture to the printing plate surface 31a.
  • the plurality of two-fluid sprayers 100 are provided so as to be arranged in the width direction, it is possible to uniformly supply moisture to the printing plate surface 31a. It is possible to reliably ensure a print quality.
  • the configuration can be simple, and it is possible to decrease a manufacturing cost or a material cost.
  • the present invention is not limited to the above-described embodiments, and can be performed so as to be variously modified within a scope which does not depart from the gist of the present invention.
  • the configurations of the above-described embodiments can be appropriately selected if necessary, and may be appropriately combined.
  • a movement mechanism which reciprocates the two-fluid sprayer 100 in the width direction may be further provided, and the two-fluid sprayer 100 may be configured so as to be moved. In this case, it is possible to uniformly supply moisture to the printing plate surface 31a even when the installation number of the two-fluid sprayers 100 is reduced.
  • the moisture supply unit 50 and the two-fluid sprayer 100 may be used so as to be combined.
  • the moisture supply unit 50 and the two-fluid sprayer 100 are provided so as to be arranged in the width direction or the vertical direction. In this way, the moisture supply unit 50 and the two-fluid sprayer 100 are together used, the entire post-ink transfer region R 1 is humidified by the moisture supply unit 50, the printing plate surface 31a is partially humidified by the two-fluid sprayer 100, and it is possible to more effectively prevent the drying of the printing plate surface 31a.
  • the corrugated fiberboard S may be transferred without being suctioned. In this case, stability of the transport of the corrugated fiberboard S decreased. However, a simple configuration can be realized.
  • the controllers 90 and 90' may be omitted.
  • a monitor display portion
  • the temperature-humidity sensor 81 may be omitted. In this case, a simpler configuration can be realized. It is possible to further reduce the cost of device.
  • the communication portion 53 in the flexographic printer of the first embodiment may extend in the horizontal direction, and may be linearly formed without being curved. In this case, water droplets easily flow into the post-ink transfer region R 1 . However, it is possible to reduce the manufacturing cost of the communication portion 53.
  • the fan 54 in the flexographic printer of the first embodiment may be omitted. In this case, supplying efficiency of mist is decreased.
  • the fan opening portion 513 and the suction opening portion 515 in the storage portion 51 can be omitted, a simple configuration can be realized, and it is possible to reduce the cost of device.
  • a device which heats water stored in the storage portion 51 so as to generate steam may be used in addition to or instead of the ultrasonic mist generator 52.
  • the steam generation device may be used in addition to or instead of the ultrasonic mist generator 52.
  • influence of heat emitted from the steam generation device is generated, it is possible to generate steam using a general humidification unit.
  • the trays 70 and 110 may be omitted. In this case, even when there is a possibility that the water droplets are dropped from the guide 60, a simple configuration can be realized, and it is possible to reduce the cost of device.
  • the guide 60 may be omitted. In this case, although when the mist supplied to the post-ink transfer region R 1 is easily diffused, a simple configuration is realized, and it is possible to reduce the cost of device.
  • water based ink is not used, and an UV ink or an oil based ink may be used.
  • an UV ink or an oil based ink the dry unit is changed from a heating type unit to an UV irradiation type unit, it is possible to prevent the amount of the moisture on the printing plate surface 31 from being insufficient due to heat emitted from the dry unit.
  • an organic solvent is used as the ink solvent.
  • the flexographic printer is not limited so as to be applied to the box-making machine, and the flexographic printer may be singularly used.
  • the corrugated fiberboard is exemplified as the object to be printed.
  • the present flexographic printer can be applied so as to print various sheet kinds.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)
  • Rotary Presses (AREA)
EP15853294.5A 2014-10-20 2015-09-11 Flexographiedrucker und kartonherstellungsmaschine Pending EP3210778A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014213577A JP6912155B2 (ja) 2014-10-20 2014-10-20 フレキソ印刷機および製函機
PCT/JP2015/075788 WO2016063650A1 (ja) 2014-10-20 2015-09-11 フレキソ印刷機および製函機

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EP3210778A1 true EP3210778A1 (de) 2017-08-30
EP3210778A4 EP3210778A4 (de) 2018-03-14

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US20170291408A1 (en) 2017-10-12
KR20170034906A (ko) 2017-03-29
CN106573464B (zh) 2019-11-26
KR101981405B1 (ko) 2019-05-22
WO2016063650A1 (ja) 2016-04-28
JP2016078374A (ja) 2016-05-16
JP6912155B2 (ja) 2021-07-28
CN106573464A (zh) 2017-04-19
EP3210778A4 (de) 2018-03-14

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